A pressure vessel is a closed container designed to hold gases or liquids at a pressure substantially different from the surrounding  pressure. The main purpose of implementing a pressure vessel inspection is to ensure that each pressure vessel is safely operated and maintained. Pressure vessels usually fail in releasing vast stores of energy and contents. This inspection may be external, internal, or both and use a variety of non-destructive examination techniques. Pressure vessels can fall into several different categories, each with its own risk.

However, the end result is Failure poses safety risk to personnel. Failure may loss or expose other critical components. Failure may result in the release of hazardous or toxic contents, Environmental pollution, or loss of production, may occur.

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